* H.264 MP4 to Annex B byte stream format filter
* Copyright (c) 2007 Benoit Fouet <benoit.fouet@free.fr>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <string.h>
+
#include "libavutil/intreadwrite.h"
+#include "libavutil/mem.h"
#include "avcodec.h"
typedef struct H264BSFContext {
int extradata_parsed;
} H264BSFContext;
-static int alloc_and_copy(uint8_t **poutbuf, int *poutbuf_size,
+static int alloc_and_copy(uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *sps_pps, uint32_t sps_pps_size,
- const uint8_t *in, uint32_t in_size) {
- uint32_t offset = *poutbuf_size;
+ const uint8_t *in, uint32_t in_size)
+{
+ uint32_t offset = *poutbuf_size;
uint8_t nal_header_size = offset ? 3 : 4;
- void *tmp;
+ int err;
- *poutbuf_size += sps_pps_size+in_size+nal_header_size;
- tmp = av_realloc(*poutbuf, *poutbuf_size);
- if (!tmp)
- return AVERROR(ENOMEM);
- *poutbuf = tmp;
+ *poutbuf_size += sps_pps_size + in_size + nal_header_size;
+ if ((err = av_reallocp(poutbuf,
+ *poutbuf_size + FF_INPUT_BUFFER_PADDING_SIZE)) < 0) {
+ *poutbuf_size = 0;
+ return err;
+ }
if (sps_pps)
- memcpy(*poutbuf+offset, sps_pps, sps_pps_size);
- memcpy(*poutbuf+sps_pps_size+nal_header_size+offset, in, in_size);
+ memcpy(*poutbuf + offset, sps_pps, sps_pps_size);
+ memcpy(*poutbuf + sps_pps_size + nal_header_size + offset, in, in_size);
if (!offset) {
- AV_WB32(*poutbuf+sps_pps_size, 1);
+ AV_WB32(*poutbuf + sps_pps_size, 1);
} else {
- (*poutbuf+offset+sps_pps_size)[0] = (*poutbuf+offset+sps_pps_size)[1] = 0;
- (*poutbuf+offset+sps_pps_size)[2] = 1;
+ (*poutbuf + offset + sps_pps_size)[0] =
+ (*poutbuf + offset + sps_pps_size)[1] = 0;
+ (*poutbuf + offset + sps_pps_size)[2] = 1;
}
return 0;
}
+static int h264_extradata_to_annexb(AVCodecContext *avctx, const int padding)
+{
+ uint16_t unit_size;
+ uint64_t total_size = 0;
+ uint8_t *out = NULL, unit_nb, sps_done = 0,
+ sps_seen = 0, pps_seen = 0;
+ const uint8_t *extradata = avctx->extradata + 4;
+ static const uint8_t nalu_header[4] = { 0, 0, 0, 1 };
+ int length_size = (*extradata++ & 0x3) + 1; // retrieve length coded size
+
+ if (length_size == 3)
+ return AVERROR(EINVAL);
+
+ /* retrieve sps and pps unit(s) */
+ unit_nb = *extradata++ & 0x1f; /* number of sps unit(s) */
+ if (!unit_nb) {
+ unit_nb = *extradata++; /* number of pps unit(s) */
+ sps_done++;
+
+ if (unit_nb)
+ pps_seen = 1;
+ } else {
+ sps_seen = 1;
+ }
+
+ while (unit_nb--) {
+ int err;
+
+ unit_size = AV_RB16(extradata);
+ total_size += unit_size + 4;
+ if (total_size > INT_MAX - padding ||
+ extradata + 2 + unit_size > avctx->extradata +
+ avctx->extradata_size) {
+ av_free(out);
+ return AVERROR(EINVAL);
+ }
+ if ((err = av_reallocp(&out, total_size + padding)) < 0)
+ return err;
+ memcpy(out + total_size - unit_size - 4, nalu_header, 4);
+ memcpy(out + total_size - unit_size, extradata + 2, unit_size);
+ extradata += 2 + unit_size;
+
+ if (!unit_nb && !sps_done++) {
+ unit_nb = *extradata++; /* number of pps unit(s) */
+ if (unit_nb)
+ pps_seen = 1;
+ }
+ }
+
+ if (out)
+ memset(out + total_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+
+ if (!sps_seen)
+ av_log(avctx, AV_LOG_WARNING,
+ "Warning: SPS NALU missing or invalid. "
+ "The resulting stream may not play.\n");
+
+ if (!pps_seen)
+ av_log(avctx, AV_LOG_WARNING,
+ "Warning: PPS NALU missing or invalid. "
+ "The resulting stream may not play.\n");
+
+ av_free(avctx->extradata);
+ avctx->extradata = out;
+ avctx->extradata_size = total_size;
+
+ return length_size;
+}
+
static int h264_mp4toannexb_filter(AVBitStreamFilterContext *bsfc,
AVCodecContext *avctx, const char *args,
- uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size,
- int keyframe) {
+ uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size,
+ int keyframe)
+{
H264BSFContext *ctx = bsfc->priv_data;
uint8_t unit_type;
int32_t nal_size;
- uint32_t cumul_size = 0;
+ uint32_t cumul_size = 0;
const uint8_t *buf_end = buf + buf_size;
+ int ret = 0;
/* nothing to filter */
if (!avctx->extradata || avctx->extradata_size < 6) {
- *poutbuf = (uint8_t*) buf;
+ *poutbuf = (uint8_t *)buf;
*poutbuf_size = buf_size;
return 0;
}
/* retrieve sps and pps NAL units from extradata */
if (!ctx->extradata_parsed) {
- uint16_t unit_size;
- uint64_t total_size = 0;
- uint8_t *out = NULL, unit_nb, sps_done = 0, sps_seen = 0, pps_seen = 0;
- const uint8_t *extradata = avctx->extradata+4;
- static const uint8_t nalu_header[4] = {0, 0, 0, 1};
-
- /* retrieve length coded size */
- ctx->length_size = (*extradata++ & 0x3) + 1;
- if (ctx->length_size == 3)
- return AVERROR(EINVAL);
-
- /* retrieve sps and pps unit(s) */
- unit_nb = *extradata++ & 0x1f; /* number of sps unit(s) */
- if (!unit_nb) {
- unit_nb = *extradata++; /* number of pps unit(s) */
- sps_done++;
-
- if (unit_nb)
- pps_seen = 1;
- } else {
- sps_seen = 1;
- }
-
- while (unit_nb--) {
- void *tmp;
-
- unit_size = AV_RB16(extradata);
- total_size += unit_size+4;
- if (total_size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE ||
- extradata+2+unit_size > avctx->extradata+avctx->extradata_size) {
- av_free(out);
- return AVERROR(EINVAL);
- }
- tmp = av_realloc(out, total_size + FF_INPUT_BUFFER_PADDING_SIZE);
- if (!tmp) {
- av_free(out);
- return AVERROR(ENOMEM);
- }
- out = tmp;
- memcpy(out+total_size-unit_size-4, nalu_header, 4);
- memcpy(out+total_size-unit_size, extradata+2, unit_size);
- extradata += 2+unit_size;
-
- if (!unit_nb && !sps_done++)
- unit_nb = *extradata++; /* number of pps unit(s) */
- }
-
- if(out)
- memset(out + total_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
-
- if (!sps_seen)
- av_log(avctx, AV_LOG_WARNING, "Warning: SPS NALU missing or invalid. The resulting stream may not play.\n");
- if (!pps_seen)
- av_log(avctx, AV_LOG_WARNING, "Warning: PPS NALU missing or invalid. The resulting stream may not play.\n");
-
- av_free(avctx->extradata);
- avctx->extradata = out;
- avctx->extradata_size = total_size;
+ ret = h264_extradata_to_annexb(avctx, FF_INPUT_BUFFER_PADDING_SIZE);
+ if (ret < 0)
+ return ret;
+ ctx->length_size = ret;
ctx->first_idr = 1;
ctx->extradata_parsed = 1;
}
*poutbuf_size = 0;
- *poutbuf = NULL;
+ *poutbuf = NULL;
do {
if (buf + ctx->length_size > buf_end)
goto fail;
} else
nal_size = AV_RB32(buf);
- buf += ctx->length_size;
+ buf += ctx->length_size;
unit_type = *buf & 0x1f;
if (buf + nal_size > buf_end || nal_size < 0)
ctx->first_idr = 0;
} else {
if (alloc_and_copy(poutbuf, poutbuf_size,
- NULL, 0,
- buf, nal_size) < 0)
+ NULL, 0, buf, nal_size) < 0)
goto fail;
if (!ctx->first_idr && unit_type == 1)
ctx->first_idr = 1;
}
- buf += nal_size;
+ buf += nal_size;
cumul_size += nal_size + ctx->length_size;
} while (cumul_size < buf_size);
sizeof(H264BSFContext),
h264_mp4toannexb_filter,
};
-
projects / ffmpeg / blobdiff